Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d6539d4eb54a2e…

MALICIOUS

PDF

74.4 KB Created: 2021-05-07 23:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37314c501a8ac7074e4f22a92b42f3a8 SHA-1: 46a7394aac18d62141d9780a0463b8a109ceb0d3 SHA-256: 64d6539d4eb54a2ec9339026c73b97ac640f30c0a799a661405af2141456e2bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains, indicating a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=dometic+refrigerator+rm2652+parts+list
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/6f2d51b73e.pdf
    • http://bukufekuda.22web.org/how_to_compare_two_categorical_variables.pdf
    • https://ririsibonegibo.weebly.com/uploads/1/3/4/5/134596323/1883225.pdf
    • https://cdn-cms.f-static.net/uploads/4389074/normal_604fd0c2da0ee.pdf
    • https://static.s123-cdn-static.com/uploads/4423137/normal_5ff1b83c9842e.pdf
    • https://bojumojomugo.weebly.com/uploads/1/3/4/8/134850871/7948133.pdf
    • http://evakuator-uga.ru/mokesixuremimaxofunuwaw6doo.pdf
    • http://supobesopo.mygamesonline.org/gibilutuxinozelowosogaral.pdf
    • http://urro-hu.com/the_dispossessed_chapter_9_summaryvflbp.pdf
    • https://static.s123-cdn-static.com/uploads/4366308/normal_5fcc599eeaf46.pdf
    • https://zezawimikosalef.weebly.com/uploads/1/3/5/3/135329884/045b280c.pdf
    • http://pressit.space/41800243971vu1tw.pdf
    • https://cdn-cms.f-static.net/uploads/4485313/normal_6067861800a7b.pdf
    • http://xumupizaxuto.scienceontheweb.net/23356376392.pdf
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/6869803.pdf
    • http://artrosil.xyz/54107960372czoxb.pdf
    • https://numemepo.weebly.com/uploads/1/3/0/9/130969514/winavibenozuma.pdf
    • https://xavamukunakupa.weebly.com/uploads/1/3/1/4/131437969/wozefomolovuzumojuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lepoxas.rf.gd/tifamev.pdf
    • http://mudozegiviw.epizy.com/lansweeper_security_reports.pdf
    • http://nemusif.rf.gd/46779596208.pdf
    • http://sevezogare.rf.gd/bobadamopu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e142.bin
486dbe28ed56a96a44907224eeca070bdc90615d54beb60875879a3f5db26ed2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 5744 bytes
font_01_sfnt_off0000f4c6.bin
795765e39a98e1c30ae81efb2b1e88ccab927685a5b2aa577f2350aa590e3359		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 11248 bytes

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